Derrick



July 15, 1930. I A. B. cROsTHwArr DERRICK Filed Oct 21. 1927 s SheetsSheet 1 INVENTOR ATTO RN EY y 19 30. A. a. CROSTHWAITY 1,770,845

DERRICK Filed Oct. 21. 1927 a Sheets-Sheet 2 Z/ I id if Z? 7 /Z? Y Z! Z INVENTOR ATTO R N EY July 15, 1930. A. B. CROSTHWAIT DERRICK Filed 001;. 21.

5 sheets sheet 3 INVENTOR ATTOR N EY Patented July.15,"1

. ASA B. cRosrHwAInor seam-Mex co '7 DERRICK- Applicationfiledlqctober 2i, eieahfse arn ge at n .1

j The invention relates to de'rricks, theobject 8 isbrazed atfthe .uppereud ofsection 1? t0? i being to provide a strong'telescopic structure lorm a e-eat forth e crownrblock 9 of the-deri which maybe transported to the point of use. rick: The section1fisprovided at its upper and raised by hydraulic ;power. The four end with aIpa-ir ofpetcocks t'o prevent escape V posts are tubular, each in multiple sections in" of liquidwhenfluid pressure applied. The sliding-relation and packed fluid-tight at the =fi uid;pressure is applie'd 'toj each; post by a joints by which air may be pumped in to" valve 110 one of which is provided witlrconlengthen the posts' and raise the derrick. A. ducting ipipes. connectingin amainto a hy-;

set of castings mountedin the bottom sill. draulicpump. The bottom post sections rest permits itto be Wheeled to place. of use incol in a casting'fhaving an integral sockettherelapsed condition and pumped. up to the reforf'There are fourof thesec'astings; one for, quired height. The means are provided for ieacli mast for pole, boltslhnakingthe bottom 7 effectively bracing the structure which Will firn'n The bottom sills of the derrick 15; 15 hereinafter be fully described,and the novel clamp to thecastings 135133 apairofgtapered v 15 features specified in'the claim. a i 7 holtslffi wit fa reducedscrew threaded end 16f In the accompanying drawings, illustrat-' onjwhich ene be drawn tight after the: ing the invention: f t I taperefcl bodyhasbeen struck a blow tojefie'ct F gure'l is a side elevation of a derrick ema solid onnection; Twojl hf these bolts are: weed-1e11-e eh sme ,ofithefs'illsif iThe bottom" bodying the invention.

' 1 Figure 2 is a cross section on the plane sills 'areo f angle'irony Ea h tubul j i t jg of Figure 1. U 1 'provid dwith a pair ofbraiedjcolla'rs 17, 1f? 7 Figure 3 is a-vertical section. through one to which are hooked:fiexible 'connections asf i multiple section of the post. chains,'( see Fig-urea) adapted to be wound Figure 4 shows flexible strengthening .on itfllILllllilS, (seeFigrdeQ) rotatedby'a' #8 means. v 7 i 'squared sliaft'-19'andlocked'byapawl'20 (10: Figure 5 is a transverse sectionof a post 'operatingwith aratchet' 21. ThusQthe'masts' and chain connection. i are drawni'into jtight engagement with iron Figure 6 is a section on the plane 61-6 of beams, theendsjof which are shod with semi r Figurelr r g c vlind'rical terminals 22iwliichfbear against 30 Figure 7 is asection on the plane 7+7 of the "mast sides with a lining of non-abrasive Figure l. g I y I Figure 8 is a sectional detail showing a b cea'by brazed gametes; "Thisconstruo material as Wood; The terminals 22 are ladder support, and I i g ti o'n prevents sinking ofth'efmasttubes andf Figure 9 is a detail of aladder in use. gives the structure gi eatfstability. The botj 35 Referringin detail to the drawings. tom mast sect ons 'areconnected between'eacli The frame of thederrick is composedof pairby'a structuraliron beam; 23 secured to; 1 four tubular posts 1, 2, 3, and 4 of a size to a right angled sleevepassed'o'ver the section telescope Within each other at adjacent joints. and locked bya set s'crew2l, (see Figure 6),, I employ multiple sections, three asherein the beams 23 being secured to the wedging shown, of sulficient aggregate length when asclamps l6and studbolt. A ginpole is bolted ea v sembled to give, the; derrick the height retothejmast helow-the-crownblockSa de; v quired. .The bottom section of each tubular 'ries a sheave 30*forhoistin'g a cable, The der post section is plugged oiltight; as indicated riclrisinounted on' castings provided with Y 5 at 5,. Figure 3,-and the upper end carries a sockets 26 bolted to the corner sillspermitting 45 screw cap by which packing may be used at: it' to be, shifted from place to place; on :fourv the joint with the'adjacenttsection 1", the-upcasters;-- I provide a sectional ladder 27 with per end of which has a similar packingcap to pivoted bolted joints and a'pair of hooks 28 make a seal with the top post section 1. The With which the topmost; section may be hung l sections 1 and 1 at the lower ends-are brazed in eye bolts carried by the .crown'block 9. Ad-

s to a snug fitting perforatedplug 7 and a plug jacentfisections maybe usedto form adjusti ments in assembling the derrick. Rods or chains connect the crown block with the intermediate mast sections 1 and reduce vibration and rocking due to wind. I A hand winch is mounted on one of the masts for hoisting purposes, the squared shaft of which permits a crank to be applied for hoisting. In operation, an adjustment is possible at all times by means of the ladder, the hinged section of which forms a tripod (seeFigureQ), to facilitate erection of the derrick.]-.,- In erecting the derrick the bottom sills are bolted together at the corner to form a firm foundation. The 7 three ladder sections are light enough so that three men can stand them up to form a tripod over the corner of the main foundation. I

pass thru the topof the tripod a line and secure it to the end of the derrick post ,by'means of which the winch facilitates raising the derrick posts and locating them inthe sockets in the corner foundation. Ithensecure in place 3 the lower struts to steady, the lower mast section'and connect the pipe system to a hydraulic" pump by which thetelescopic' sections of the mast may beadjustedvertic H The f posts being assembledthe ladder is hooked to atop chain at the top of the posts and one end oftthe gin pole is also connected, the derrick is then raised to its full height carrying the ladder and: gin pole with it. An operator then climbs the ladder and secures the other end of I the gin pole and passes aro'p'e through the plicijty of telescopically associatedvertic-ally sheave at its top anclthe rope is lowered and attachedto the'crown block. 7 By means of the winch'the crown block is raised and the operator seats it in its sockets onthe end of'the pole, the posts being drawn to alignment withvthe sockets by the chain and ahand jack; After assembling and adjusting the derrick, a cement or timber supportrnay be placed beneath the bottom sills toprevent shifting of 'th'erolling base. As the apparatus is made of steel, and has great, stability, it is adapted to service in oil fields. A V Y Havingthus described the intention, what.

I claim is 7 A ClQIIlCkzCOHStI't-ICUOH comprising a-multiadjustable frame'sections, collars arranged at.

-.;';spa'ced intervals uponeach of the sections,

beams disposed horizontally of. the derrick ad acent to andbetween said collars, terminals for the beams horizontally disposed thereon for flush engagement with the frame sections, drums mounted upon the beams, and flexible connections carried upon the collars having adpistable connection with the drums:

to prevent displacement ofthe beams front the frame sections." 7 Intestimony whereof I afiiX-my signature,

ASA B. CROSTHWAIT, 

